PRELIMINARY
CY7C2561KV18, CY7C2576KV18
CY7C2563KV18, CY7C2565KV18
Document Number: 001-15887 Rev. *E
Page 11 of 29
Table 4. Write Cycle Descriptions
The write cycle description table for CY7C2561KV18 and CY7C2563KV18 follows. [4, 12]
BWS0/
NWS0
BWS1/
NWS1
K
K
Comments
L
L
L–H
–
During the data portion of a write sequence
:
CY7C2561KV18
− both nibbles (D[7:0]) are written into the device.
CY7C2563KV18
− both bytes (D[17:0]) are written into the device.
L
L
–
L-H During the data portion of a write sequence
:
CY7C2561KV18
− both nibbles (D[7:0]) are written into the device.
CY7C2563KV18
− both bytes (D[17:0]) are written into the device.
L
H
L–H
–
During the data portion of a write sequence
:
CY7C2561KV18
− only the lower nibble (D[3:0]) is written into the device, D[7:4] remains unaltered.
CY7C2563KV18
− only the lower byte (D[8:0]) is written into the device, D[17:9] remains unaltered.
L
H
–
L–H During the data portion of a write sequence
:
CY7C2561KV18
− only the lower nibble (D[3:0]) is written into the device, D[7:4] remains unaltered.
CY7C2563KV18
− only the lower byte (D[8:0]) is written into the device, D[17:9] remains unaltered.
H
L
L–H
–
During the data portion of a write sequence
:
CY7C2561KV18
− only the upper nibble (D[7:4]) is written into the device, D[3:0] remains unaltered.
CY7C2563KV18
− only the upper byte (D[17:9]) is written into the device, D[8:0] remains unaltered.
H
L
–
L–H During the data portion of a write sequence
:
CY7C2561KV18
− only the upper nibble (D[7:4]) is written into the device, D[3:0] remains unaltered.
CY7C2563KV18
− only the upper byte (D[17:9]) is written into the device, D[8:0] remains unaltered.
H
H
L–H
–
No data is written into the devices during this portion of a write operation.
H
H
–
L–H No data is written into the devices during this portion of a write operation.
Table 5. Write Cycle Descriptions
The write cycle description table for CY7C2576KV18 follows. [4, 12]
BWS0
K
K
Comments
L
L–H
–
During the data portion of a write sequence, the single byte (D[8:0]) is written into the device.
L
–
L–H
During the data portion of a write sequence, the single byte (D[8:0]) is written into the device.
H
L–H
–
No data is written into the device during this portion of a write operation.
H
–
L–H
No data is written into the device during this portion of a write operation.
Note
12. Is based on a write cycle that was initiated in accordance with the Write Cycle Descriptions table. NWS0, NWS1, BWS0, BWS1, BWS2, and BWS3 can be altered on
different portions of a write cycle, as long as the setup and hold requirements are achieved.
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